JSPM

Test whether a path exists on the filesystem.

Checks existence of email addresses

The missing existential operator for JavaScript. Returns true unless a variable is null or undefined

Check for the existential value of a variable. Assign value by default.

Checks existence of E-Mail DNS MX records.

Stimulus controller to remove elements from the dom, and be notified with an event when they are added.

Check whether an email address exists.

Check if an SMTP server accepts emails to a given address.

A library written in Typescript which tries to check if an email address really exists

Checks existence of email addresses

A variable lives here

A Node.js library to check the existence of an email address by verifying with the domain's mail exchange (MX) servers and using SMTP commands.

Check for the existential value of a variable/object. Assign one if the value doesn't exist.

A monadic wrapper for dealing with existence

All things created by God

Tests whether a path exists on the filesystem.

Checks if file or directory with name given as first argument exist and returns proper exit code.

Utility functions that emulate CoffeeScript existence operator

run useful tests on your arrays or hashes of arrays or hashes

Check if a file exists

Check if a GitHub repo exists

Test whether a path exists on the filesystem.

Check whether an email address exists.

Check for the existential value of a variable. Assign value by default.

Verify email address by checking MX records and SMTP connection.

Checks existence of email addressesi including MX, telnet and regex validation

CLI to Check if a GitHub repo exists

A simple wrapper around an object that will warn when you access keys that aren't defined (using the magic of ES6 Proxies)

API Client for Proof of Existence